Arrangement in conveyors for lumber



Jan. 12, 1960 A. RYSTI 2,920,741

ARRANGEMENT IN CONVEYORS FOR LUMBER Filed Aug. 26, 1957 AL PO 1Q YS 7'/r INVENTOR.

A T7'ORNEX United States Patent "ice ARRANGEMENT IN CONVEYORS FOR LUMBERAlpo Rysti, Kaukas, Finland, assignor to 0y. Kaukas Ab.,

When transporting boards by a conveyor so that the boards aretransferred from one conveyor equipped with pusher fingers to anotherone, it may happen, if there is a crooked board, that one end of theboard is lifted to such extent that the pusher fingers on that sidetravel underneath the board and only the ones on the other side move theboard forward. Thus such board might come into an oblique position onarriving at the following conveyor.

This invention relates to an arrangement eliminating this inconvenienceand is generally characterized by the installation of feedingdevicesplaced at the end of the first conveyor and the beginning of the secondone, which are arranged to perform a linear feeding motion in the levelof the second conveyor, through the efiect of the pusher fingers on thefirst conveyor, and thereafter automatically to return into theirinitial position.

In the following the invention is described in more detail withreference to the embodiment shown in the accompanying drawing.

In the drawing 1 designates a conveyor equipped with pusher fingers 2,which conveyor feeds the boards 3 delivering them to another conveyor 4without pusher finger. In the embodiment shown the driving wheels of thefirst conveyor and the return wheels of the second conveyor are mountedon common shaft.

Adjacent this shaft there is a feeding element 5- positioned at the sideof each chain of the first conveyor, to which a roller 6 is connected atsuch a level that the pusher fingers 2 will strike against it. Therollers 6 are in addition thereto connected to restoring devicesarranged on one or both sides of the conveyor and comprising a cylinder7 having a guide rod 8 and a coil spring fitted therein. The feedingelements 5 are mounted turnably in the lateral direction (see Fig. 2) sothat they due to the effect of a spring, normally remain in a positionslightly inclined to one side. The back edges of the feeding devices 5are bevelled and this fact in addition to their inclination causes thefeeding elements 5 2,920,741 Patented Jan. 12, 1960 to turn down asshown by broken lines in Fig. 2, when a board carried by the conveyor 1strikes against them from behind so that the board can travel over them,after which they rise again.

When the board carried by the conveyor 1 has approached so far, or intoposition A in Fig. 1, that the pusher fingers 2 are no longer in touchwith it, the pusher fingers 2 hit the rollers 6 of the feeding device 5thereby pushing the feeding devices 5 steered by the rods 8rectilinearly in the direction of the upper level of conveyor 4. Thefeeding devices now shift their position as shown by broken lina,pushing at the same time the board into the position also shown bybroken lines and as soon as the pusher fingers 2 have reached theposition shown by broken lines, so that they move beneath the rollers 6,the feeding devices return to their initial position due to the releasesprings. The feeding devices 5 thus move the board in correct positionupon the conveyor 4 regardless thereof, that the pusher fingers 2 leavethe boards in an oblique position.

The foregoing construction is intended only to illustrate the invention,thus it goes without saying, that constructional details can be variedin many ways without parting from the basic idea of the invention.

What I claim is:

1. In mechanism for conveying boards, a first chain driven conveyor anda second conveyor at the end of said first conveyor, pusher fingerscarried by said first conveyor, feeding devices positioned adjacent theend of said first conveyor and the beginning of said second conveyor,and mounted for rectilinear feeding motionalong the level of said secondconveyor, means for eifecting said rectilinear motion by the action ofsaid pusher fingers and means to automatically restore said feedingdevices to initial position on completion of said rectilinear motion.

2. Mechanism as in claim 1 wherein one of said feeding devices isinstalled next to each chain of said chain conveyor, said feedingdevices including rollers, said rollers positioned to lie in line withsaid pusher fingers.

3. Mechanism as in claim 2 wherein cylinders having guide rodslongitudinally slidable therein are mounted alongside of said secondconveyor, said feeding devices being connected to said guide rods andsprings mounted in said cylinders and engaging said guide rods torestore said feeding devices to said initial position.

References Cited in the file of this patent UNITED STATES PATENTS1,934,087 Payzant Nov. 7, 1933 2,501,961 Paton Mar. 28, 1950 2,627,968Thompson Feb. 10, 1953

